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There are three types of errors, that should be handled correctly.

• Error during service initialization on a node, included into assignment. In this case the problematic node sends failure details to the coordinator over the communication protocol. Once the coordinator receives the failure details, it sends a discovery message, containing this information, to all nodes, so the deploying methods can throw a corresponding exception.
• Failure of a node, included into assignment. This situation triggers recalculation of service deployment assignments. Coordinator node sends another discovery message with a set of new assignments in it. If a node already initialized a service and it is not present in the new assignments set, then the service should be cancelled.
• Coordinator failure. This situation is processed in a similar way as the previous one. The only difference is that the nodes should resend deployment results to the new coordinator.

Service versioning

TBD

Risks and Assumptions

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